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EXTENsIo-N'TUBB PoR LAMPS AND GHANDBLIERS. No. 301,861. Patented July15, 1884.

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F. ECHAPMAN u R. A. WOODING. EXTENSION. TUBE FOB. LAMPS AND CHANDELIERS.

Patented July 15, 1884-.

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UNITED STATES- PATENT OFFICE.

FRANK H eHAPMAN, or MERIDRN, AND RALPH A. wooDING, or HRNsING- ,TON,CONNECTICUT, ASSIGNORS TO THE CHARLES PARKER COMPANY,

OF MERIDEN, CONNECTICUT.

EXTENSION-TUBE Fo-R I AM'Ps AND CHAN'DELIERS.

SPECIFICATION forming part of Letters Patent No 301,861, dated July 15,1884.

Application led June Q9, 1883. (No model.)

.To all whom, it may concern:

Be it known that we, FRANK H. CHAPMAN, a citizen of the' United States,residing at Meriden, in the county of New Haven and 5 State ofConnecticut, and RALPH A. Woon- ING, a citizen ofthe United States,residing at Kensington, in the county of Hartford and State ofConnecticut, have invented certain new and useful Improvements inExtension- Io Tubesfor Lamps and Chandeliers; and we do hereby declarethe following to be a full, clear, and exact description of theinvention, such as will enable others skilled in vthe art to which itappertains to make and use the same, r 5 reference being had tothe'aecompanying drawings, and to letters or gures of reference markedthereon, which forln a part of this specification.

This invention relates to devices for clampi feo ing together thetelescopic tubes of the eXtension-iixture of alainp or chandelier, inorder that the latter may be held at any desired elevation, and todevices for releasing the said tubes from this clamping, so that theymay be The said invention consists in a cam pivoted to one of said tubesand bearing against the other, in combination with means for turningsaid cam in one'direction, so as to cause 3o it to operate, as stated.It also consists in the combination of said cam and its actuatingdevices with a shoe, which is forced by said cam through an opening inthe inner tube against the inner side of 35 the outer tube, for thepurpose of clamping said tubes, as stated.

It also consists in the combination, with said cam and tubes, ofsuitable releasing devices.

4o It also consists in the combination, with said tubes and cam, Vof aspring-drum in ythe canopy, a cord passingthence to the cam to operatethe latter, and a guide-pulleyin the bottom'of the canopy, whereby thesaid cord is directed to the center of the inner tube, all

as hereinafter set forth.

Heretofore tubes of this sort have frequently been clamped together bymeans of lwedges operating against them, either mediately or 5oimmediately, or by other sliding pieces, which operate against inclinesand cause certain parts tobind against the tubes. In such con-vstructions, however, there is always some risk pieces, andin case thecord or other attachment thereof breaks this is very likely to happen.Such pieces, when thus displaced, are easily lost, and the work ofreplacing them in their former positions is inconvenient and tedious.Moreover, they wearthe tubes. needwith. There are also otherdisadvantages which need not here be. enlarged upon. For these defectsou cam hereinafter described is an effectual remedy. l

In the accompanying drawings, Figurel represents a longitudinal verticalsection through the canopy and extension-tubes of an extensionchandelier-fixture provided with my improvedeclamping devices. Fig. 2represents a detail interiorperspective View of the latter and parts ofthe tubes, showing `the cam and shoeiu operation.` Fig. 3 represents adetail view of the cam and its immediate attachments. Fig. 4t representsany exterior detail View of the upper end ofthe inner tube. Fig. 5represents a detail perspective View of the tion taken through the tubesand incloscd devices just above the cam. Figs. 7,8, 9, 10,

tion.

A designates the canopy of an extension-fixture; B, the fixed outertube,se'cured as usual thereto; C, the inner tube, movableJtelescopically within said outer tube, and provided near its upper endwith an opening, c; and D, a shoe which lits. said opening, but hasVfree .motion inward and outward in the same. The outerpface of saidshoe conforms to the inner face of outer tube, B, and the fiat innerface of said shoe is provided with a vertical guideway or channel, d.which receives thevoperative part of a cam, E, pivoted on gudgeons ewithin said inner tube. To the opposite part or ltail e of sai-d @am areattached an upwardly-extending cord or chain, F, and aldownwardly-eXtending cord or rod, G, both being incloscd within theextension tubes aforesaid. The said cord F passes upward to a drum, H,which turns in bearings on said H', which tends to rotate said drum soas to draw on said cord and cause saidcam to turn and 11 representmodifications of my invencanopy, and provided with an inclosed spring,

of dislodging the loose wedges or other loose lessly by slidingup anddown in contact thereshoe, and Fig. 6 represents a transverse sec- IOOagainst said shoe and force the latter against the outer tube, therebyclamping 'said tubes at any desired point or degree of extension. Apulley, I, turns in bearings in the lower part of canopy A, and guidessaid cord into the center of the tubes. A guide-pulley somewhatsimilarly arranged has been used with external cords or chains, but notwith a cord or chain extending down through the tube. The drum H may beeccentrically arranged, as shown, or it may be centrally arranged withrespect to the canopy, thus bringing its axis over the center of thetubes. In this latter position the guide-pulley or some equivalentdevice would obviously be necessary.

The cord or rod G is provided at its lower end with a movable tip orhandle, J, arranged below the center box, K, through which said cord orrod passes. By pulling on this tip or handle the cam E is turned so asto release shoe D, and there is then no obstacle to moving the innertube up or down until the lights are at the desired elevation. Said tipor handle is then released, and the spring H and drum H againautomatically draw through cord F on cam E, and cause it to act, asbefore, for clamping said tubes. As the cam E is journaled securely insaid inner tube, it is not liable to displacement. It does not move upand down within the tube, wearing the same by friction. It does notrequire any special construction of either tube, exceptthe mal;- ing orleaving of opening c. It may be used without the shoe by slightlyenlarging it, but the shoe shields the outer tube from scratching, andaffords a wider, evener,.and more secure clamping-surface. Of course theshape of both shoe and cam may be considerably varied, and it may beoperated for clamping by a downward draft and released by an upwarddraft, thus reversing the arrangement shown. It may also be forcedintoclamping position by a spring arranged in the tube belowit, and bearingupward against the tail e.

Divers other changes and modifications of the various deviceshereinbefore described may be made without departing from the spirit ofmy invention. The improvements are applicable to lamp-xtures as well aschandelierfixtures.

In Figs. 7 andS we have vshown thelockingcam E pivoted in an opening, w,of a box, NV, which is secured upon the upper end of the movable tube C.In this instance said tube slides over a rod, X,which is secured tocan-l opy A, instead of sliding within a tube, B, secured to saidcanopy. Said cam acts against the outside of a shoe, Z, inclosed withinsaid box. This shoe is in nature and function the salne as shoe D,already described; but its form is varied to fit the outside of a rodinstead of the inside of a tube. Fig. 8 is a vertical sectional View ofthis modication; Fig. 9, a perspective detail view of the rod, box, cam,and shoe; Fig. l0, a detail view of the box; Fig. 11, a detail view ofthe shoe, and

Fig. 12 a detail view of the cam. The latter' is shown as journaled on arod which extends transversely through opening w,- but gudgeons on saidcam maybe used instead. The remaining devices shown in Fig. 7 arelettered like the corresponding parts in the previous figures, and theoperation is substantially the same.

Having thus fully described our invention, what we claim as new, anddesire to secure by Letters Patent, is-

1. The fixed upper part and the movable lower part of an extension lampor chandelier fixture, in combination with a cam, E, pivoted to saidlower part, a movable shoe arranged to be forced by said cam againstsaid xed part, and a suspension spring and cord attached to the tail ofsaid cam and operating to automatically cause the latter to clamp themovable and immovable parts of the fixture together, substantially asset forth.

2. The stationary upper tube, B, and the l movable inner tube, C,sliding within the former, and provided with an opening, c, inconibination with a shoe, D,fitting in said opening, but adapted to beforced outward againsttube B, and a cam, E, pivoted to the inside ofsaid inner tube, and having a suspension-cord attached to its taile,whereby the said cam may be turned to force said shoe against saidouter tube, for the purpose set forth.

3. The movable shoe D, having avertical channel or groove, d, incombination with inner tube, C, having an opening, c, which is adaptedto receive said shoe, and a pivoted cam, E, which is arranged to turnagainst said shoe and clamp said tubes B C together, the said cam ttinginto said channel, substantially as set forth.

4. The stationary upper part andthe mova ble lower part of alamp-fixture, in combination with a cam pivoted to one of said parts andarranged to clamp the same to the other part, a suspension-springlocated in the eanopy, and a cord connected to said spring and operatingon said cam independently of the weight of said lower part to cause itto clamp the said parts together, substantially as se forth.

5. A movable lower tube and a stationary upper tube for a lamp orchandelier fixture, in combination with a cam pivoted within said lowertube and arranged to clamp the same to the upper tube, and a suspensioncord and spring operating on said cam, the said cord extending downwithin said tubes and provided with a guide-pulley attached to thecanopy, substantially as set forth.

In testimony whereof we affix our signatures in presence of twowitnesses.

FRANK H. CHAPMAN. RALPH A. VOODING.

Vitnesses:

DEXTER W. PARKER, RALPH A. PALMER.

IOO

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